Anti-Dazzling Windshield with Electrochromic Light Regulation
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Solution Overview
Problem
High beams from oncoming vehicles cause dazzling to drivers, reducing their ability to observe the surroundings and increasing the risk of accidents, especially at night when the duration of dazzling can last for several seconds.
Innovation Solution
An anti-dazzling apparatus comprising a light regulation member and an acquisition module that adjusts the intensity of light from external sources based on the position of the driver's eye pupil and the external light source, using chromotropic films or liquid crystal layers to control light transmittance and reduce dazzling effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high beam is used to view the road ahead at night, then the driver's ability to see the road is improved, but the driver is exposed to dazzling from oncoming vehicles' high beams
Solution Approach 1:
The windshield is divided into multiple independent light regulation subunits (first, second, third subunits) that can be controlled separately. Each subunit corresponds to a specific region where dazzling light may enter the driver's eyes, allowing localized dimming without affecting overall visibility of the road ahead.
Solution Approach 2:
The light regulation member applies different optical properties to different regions of the windshield. Specifically, the first light regulation subunit is activated when dazzling light enters through the front region, the second when light enters through the side region, and the third when light enters through the rear region, creating locally adapted optical characteristics.
2Illumination intensity
If high beam is used to view the road ahead at night, then the driver's ability to see the road is improved, but the driver's safety is reduced due to dazzling duration
Solution Approach 1:
The system performs preliminary detection of dazzling light conditions using image acquisition devices and eye tracking technology to determine when and where dazzling light enters the driver's eyes. Based on this detection, the control module activates the appropriate light regulation subunits in advance or immediately to prevent the harmful effects of dazzling before they fully impact the driver's ability to drive safely.
3Object-affected harmful factors
If light regulation member is added to reduce dazzling, then the driver's protection from dazzling is improved, but the device complexity increases
Solution Approach 1:
The light regulation member serves multiple functions simultaneously: it acts as a windshield structure, incorporates image acquisition devices for detecting dazzling light conditions, includes eye tracking functionality to monitor driver's eye position, and contains the actual light regulation subunits for reducing dazzling. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The patent combines the windshield structure with the light regulation member into a single integrated component. The image acquisition devices, eye tracking system, and light regulation subunits are all merged into this single structure, eliminating the need for separate windshields and separate dazzle protection systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus effectively reduces the intensity of light reaching the driver's eyes, preventing dazzling and enhancing safety by minimizing the impact of high beams from both oncoming and following vehicles, thereby improving nighttime driving conditions.
Implementation Method 1
the chromotropic film is an electrochromic film, and the control module configured to control a voltage of the chromotropic film according to the dazzling region
Implementation Method 2
each of the plurality of light regulation subunits includes a liquid crystal layer and polarizers and liquid crystal control electrodes which are positioned on both opposite sides of the liquid crystal layer
Data Source
AI summary
An anti-dazzling apparatus and a control method thereof arid a vehicle are provided. The anti-dazzling apparatus includes a light regulation member and an acquisition module. The light regulation member is arranged on a light path between an external light source of a vehicle and a human eye and configured to regulate an intensity of light of the external light source, which is incident to the human eye, according to information of the human eye and information of the external light source, and the acquisition module is configured to acquire the information of the human eye and the information of the external light source.